Electrophysiological correlates of anticipatory and poststimulus components of task switching

Frini Karayanidis; Max Coltheart; Patricia T. Michie; Karen Murphy

doi:10.1111/1469-8986.00037

Electrophysiological correlates of anticipatory and poststimulus components of task switching

Frini Karayanidis^*, Max Coltheart, Patricia T. Michie, Karen Murphy

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

197 Citations (Scopus)

Abstract

Task-switching paradigms can shed light on cognitive and neural processes underlying attentional control mechanisms. An alternating runs task-switching paradigm (R. D. Rogers & S. Monsell, 1995) is used to identify ERP components associated with anticipatory and poststimulus components of task-switching processes. Subjects alternated between two tasks in a predictable series (AABB). Reaction time (RT) switch cost reduced with increasing response-stimulus (R-S) interval and a residual switch cost remained at the longest R-S interval. A switch-related positivity (D-Pos) developed in the R-S interval. D-Pos was time-locked to response onset, peaked around 400 ms post-response onset, and was unaffected by task-set interference. A switch-related negativity (D-Neg) emerged after stimulus onset. D-Neg peaked earlier with increasing R-S interval and its amplitude and latency were affected by task-set interference. D-Pos and D-Neg were interpreted within current models of task-switching.

Original language	English
Pages (from-to)	329-348
Number of pages	20
Journal	Psychophysiology
Volume	40
Issue number	3
DOIs	https://doi.org/10.1111/1469-8986.00037
Publication status	Published - May 2003

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AB - Task-switching paradigms can shed light on cognitive and neural processes underlying attentional control mechanisms. An alternating runs task-switching paradigm (R. D. Rogers & S. Monsell, 1995) is used to identify ERP components associated with anticipatory and poststimulus components of task-switching processes. Subjects alternated between two tasks in a predictable series (AABB). Reaction time (RT) switch cost reduced with increasing response-stimulus (R-S) interval and a residual switch cost remained at the longest R-S interval. A switch-related positivity (D-Pos) developed in the R-S interval. D-Pos was time-locked to response onset, peaked around 400 ms post-response onset, and was unaffected by task-set interference. A switch-related negativity (D-Neg) emerged after stimulus onset. D-Neg peaked earlier with increasing R-S interval and its amplitude and latency were affected by task-set interference. D-Pos and D-Neg were interpreted within current models of task-switching.

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Electrophysiological correlates of anticipatory and poststimulus components of task switching

Abstract

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